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प्रश्न
How many groups and periods are there in the modern periodic table?
उत्तर
There are 18 groups and 7 periods in the modern periodic table.
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संबंधित प्रश्न
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
In the following set of element, one element does not belong to the set. Select this element and state why it does not belong:
Calcium, Magnesium, Sodium, Beryllium
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
Where would you locate the element with electronic configuration 2, 8 in the modern periodic table?
How many groups and periods are there in the modern periodic table?
Select the correct answer
Identify the metalloid
The elements of one short period of the periodic table are given below in order from left to right:
Li Be B C O F Ne
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed?
(c) Place the three elements, fluorine, beryllium and nitrogen, in the order of increasing electro negativity.
(d) Which one of the above elements belongs to the halogen series?
Use the letters only written in the Periodic Table given below to answer the questions that follow:
(a) State the number of valence electrons in the atom J.(b) Which element shown forms ions with a single negative charge?
(c) Which Metallic element is more reactive than R?
(d) Which element has its electrons arranged in four shells?
Arrange the following as per instruction given in the bracket.
Cs, Na, Li, K, Rb (decreasing electronegativity)
State the following:
The group which contains highly electropositive metals including sodium.
